The lub-dub sound of the heartbeat is a vital sign that provides valuable information about cardiac health. Understanding the causes and clinical significance of the lub-dub sound can help diagnose and manage various cardiac conditions.
The pause after the “dub” is actually longer than the pause after the “lub.” That’s your heart relaxing before the next beat.
Understanding the “Lub-Dub” – More Than Just a Sound heartbeat lub dub sound
The first heart sound, "lub," is medically referred to as . It occurs at the very beginning of systole , which is the phase when the heart's lower chambers (ventricles) contract to pump blood out to the body and lungs. nhlbi, nih (.gov) How the Heart Works - How the Heart Beats | NHLBI, NIH
Recognizing these normal sounds helps clinicians identify abnormalities like splitting, murmurs, or gallops. A simple reminder that structure equals function—and rhythm matters. The lub-dub sound of the heartbeat is a
: The closure of the atrioventricular (AV) valves , which include the mitral and tricuspid valves.
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